Reword a few paragraphs in the "External Dependencies" page
Reword a few paragraphs in the "External Dependencies" page

- Rearranged some sentences to clarify meaning
- Noted "workspace rule" as a less commonly used synonym of "repository rule" (a wider change will follow)
- Removed the paragraph about WORKSPACE.bazel, which duplicates the information at the top of the page

RELNOTES:
PiperOrigin-RevId: 311322258

ButterflyNetwork/bazel,ButterflyNetwork/bazel,twitter-forks/bazel,werkt/bazel,meteorcloudy/bazel,ButterflyNetwork/bazel,davidzchen/bazel,katre/bazel,werkt/bazel,perezd/bazel,ButterflyNetwork/bazel,katre/bazel,ulfjack/bazel,bazelbuild/bazel,twitter-forks/bazel,davidzchen/bazel,safarmer/bazel,katre/bazel,cushon/bazel,meteorcloudy/bazel,werkt/bazel,ulfjack/bazel,safarmer/bazel,meteorcloudy/bazel,cushon/bazel,werkt/bazel,ButterflyNetwork/bazel,safarmer/bazel,davidzchen/bazel,davidzchen/bazel,davidzchen/bazel,ulfjack/bazel,bazelbuild/bazel,davidzchen/bazel,ulfjack/bazel,safarmer/bazel,twitter-forks/bazel,twitter-forks/bazel,cushon/bazel,perezd/bazel,perezd/bazel,perezd/bazel,meteorcloudy/bazel,safarmer/bazel,katre/bazel,bazelbuild/bazel,twitter-forks/bazel,cushon/bazel,bazelbuild/bazel,perezd/bazel,werkt/bazel,bazelbuild/bazel,meteorcloudy/bazel,ulfjack/bazel,meteorcloudy/bazel,ulfjack/bazel,cushon/bazel,ulfjack/bazel,meteorcloudy/bazel,katre/bazel,werkt/bazel,cushon/bazel,ButterflyNetwork/bazel,perezd/bazel,twitter-forks/bazel,perezd/bazel,davidzchen/bazel,safarmer/bazel,bazelbuild/bazel,katre/bazel,twitter-forks/bazel